Another problem I think is that the Melody/Soloist tracks cannot be frozen from the Mixer 'snowflake' button.
But they can be frozen from the Tracks > Freeze item. This has been reported.

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BIAB & RB2026 Win.(Audiophile), Windows 10 Pro & Windows 11, Cakewalk Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Session Keys Grand S & Electric R, Kontakt, Focusrite 18i20, KetronSD2, NS40M, Pioneer Active Monitors.